Does my ECG work correctly?
This refers to the preloaded ECG app.
Some time ago, I had a nice ECG curve on my display when starting the ECG app. Now, there is only this ZigZag (see photos). I tried all for modes (finger, finger+bias, USB, USB+bias). When I connect my self-made USB-ECG cable, I get the same. The LEDs are flickering between 6 and all LEDs. Sometimes a "BPM" is flickering shortly, but vanishing immediately again.
What do I do wrong?